Thought I would share this link. This may be an answer and it may not be.
http://en.wikipedia.org/wiki/Compari...e-book_readers
In my research, I found more ereaders using the epub format. See the second chart on this link. No I will not share my sales, they are minimal. I'm having fun and that's what matters. I just found it interesting at the difference in Amazon and B&N.
Thanks for Your Relies!
Tammy